fix import for python3s without ssl

This resolves issue #320 doing what @Lukasa suggested but with no test :( I mocked out not having ``ssl`` on my machine by creating my own ``ssl.py`` file first on my ``sys.path`` with ``raise ImportError``  and confirmed that I could create an ``HTTPConnectionPool`` and make a ``request`` to reddit.com under python3.3 with this fix. This previously failed.